Cairns in December
So, what's Cairns actually like in December? In a word: summery. It's summer, and the days are averaging 30.9 degrees.
Daytime highs average 30.9 degrees, dropping to 23.6 degrees overnight. That's a 7-degree swing between day and night. Warm days and warm nights. It doesn't cool down much, even after sunset.
December is 2.6 degrees warmer than the yearly average here.
Rainfall in December averages 379mm over about 22 days. That means roughly a 73% chance of rain on any given day, so definitely bring rain gear.
Solar exposure averages 21.8 MJ/m2 per day in December, with UV levels in the extreme range. Sunscreen, hat, and sunnies are all essential. You can burn in under 10 minutes.
With a Comfort Score of 3.5/10, December is not the most comfortable time to visit.
For your suitcase: loose cotton or linen gear, waterproof gear, and SPF 50+ sunscreen and a hat.
The sea breeze usually kicks in by early afternoon in December, which is genuinely welcome. It can knock 3 to 5 degrees off the feels-like temperature.
The full data breakdown is below. You can also see how other Australian cities compare in December.
December at a Glance
Temperature Range
Daily temperature range in December. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- Cotton or linen fabrics to stay cool
- A waterproof jacket or compact umbrella
- High SPF sunscreen (50+), sunglasses, and UV-protective clothing
Coming From Overseas?
How December in Cairns stacks up against major cities around the world.
About 23 degrees warmer and considerably wetter.
About 25 degrees warmer and considerably wetter.
About 19 degrees warmer and considerably wetter.
How December Compares
Cairns's monthly climate at a glance. December is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 31.2 | 24.5 | 689mm | 2.9 |
| Feb | 30.5 | 24.3 | 316mm | 3.4 |
| Mar | 29.5 | 23.8 | 514mm | 3.7 |
| Apr | 28.6 | 22.1 | 121mm | 5.4 |
| May | 26.1 | 20.6 | 82mm | 6.9 |
| Jun | 25.9 | 16.7 | 18mm | 9.0 |
| Jul | 24.6 | 16.9 | 66mm | 9.2 |
| Aug | 25.6 | 17.8 | 61mm | 8.6 |
| Sep | 27.1 | 19.1 | 60mm | 7.9 |
| Oct | 29.1 | 20.5 | 25mm | 7.3 |
| Nov | 30.2 | 21.7 | 61mm | 6.1 |
| Dec | 30.9 | 23.6 | 379mm | 3.5 |